20787580

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{1549}}^1$

素因数の和:1630

約数の個数: 48

約数和(自身を含む): 48434400

約数和(自身を除く): 27646820

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 61, 110, 122, 220, 244, 305, 610, 671, 1220, 1342, 1549, 2684, 3098, 3355, 6196, 6710, 7745, 13420, 15490, 17039, 30980, 34078, 68156, 85195, 94489, 170390, 188978, 340780, 377956, 472445, 944890, 1039379, 1889780, 2078758, 4157516, 5196895, 10393790, 20787580]

約数ペア:

[(1, 20787580), (2, 10393790), (4, 5196895), (5, 4157516), (10, 2078758), (11, 1889780), (20, 1039379), (22, 944890), (44, 472445), (55, 377956), (61, 340780), (110, 188978), (122, 170390), (220, 94489), (244, 85195), (305, 68156), (610, 34078), (671, 30980), (1220, 17039), (1342, 15490), (1549, 13420), (2684, 7745), (3098, 6710), (3355, 6196)]